Now for your other question. Sadly, version 1.5.1 of StackApplet uses v1.1 of the Stack Exchange API which has been deprecated. Because of this, some of the newer SE sites aren't showing up in the list.

There is an alpha version of StackApplet 1.6 that currently runs on Windows XP/Vista/7/8 that uses version 2.0 of the API. You can download it here.

If there is enough interest, I might be persuaded to create another release in the 1.5.x series that simply uses the newer 2.0 routes.

I would definitely be interested in a version 1.5.2 that allows keeping track of my account on Ebooks while using Linux. But since I seem to be the first one in over a year maybe there is not that much interest. Or is there a way to do it with the old version? Adding {"unread_reputation": 0, "last_comment_ts": 0, "site_name": "Ebooks", "unread_comments": 0, "site": "ebooks.stackexchange", "reputation_on_last_poll": 101, "notifications": 0, "user_id": "118", "last_answer_ts": 1, "unread_answers": 0}] to ~/.stackapplet/config was not successful.
–
TimJan 30 '14 at 14:14

@Tim: I really need to fix up StackApplet soon. I'll let you know when an update is ready.
–
Nathan Osman♦Jan 31 '14 at 7:28